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A rapid method for determining the weathering activation energy of metal sulfide minerals in soil

A metal sulfide and activation energy technology, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of large influence of human factors, enlarged errors, and many calculation steps

Active Publication Date: 2021-05-14
INST OF GEOCHEM CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0038] Because the method for determining the activation energy in the prior art needs to determine the reaction process by observing the change of the color of the reaction solution, the influence of human factors in the actual operation process is relatively large, so it is very easy to cause reaction errors; in addition, the calculation steps in the activation energy determination process Too much, the operation is cumbersome, and the multiple accumulation of each step of the experimental error will further expand the error. When used in the determination of activation energy, the applicability is poor; at the same time, due to the particularity of the weathering of metal sulfide minerals in soil, it is necessary to Perform rapid determination, while the activation energy determination method in the prior art usually takes a long time and cannot achieve rapid determination

Method used

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  • A rapid method for determining the weathering activation energy of metal sulfide minerals in soil
  • A rapid method for determining the weathering activation energy of metal sulfide minerals in soil
  • A rapid method for determining the weathering activation energy of metal sulfide minerals in soil

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Experimental program
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Effect test

Embodiment 1

[0093] (1) Fabrication of metal sulfide mineral electrodes

[0094] The pure and dense massive pyrite sample was cut to a suitable size to obtain a flat and measurable surface as the working area of ​​the electrode. In this embodiment, the pyrite sample is cut into a cube of 0.5 cm×0.5 cm×0.5 cm. After the copper wire is connected to the upper surface of the pyrite cube, the pyrite cube is sealed and poured with epoxy resin, so that only the bottom surface of the pyrite cube communicates with the outside world to obtain a pyrite electrode.

[0095] (2) Preparation of soil solution

[0096] Weigh 10.02 g of the air-dried meadow soil sample that passed through a 2mm aperture sieve into a beaker. Add to remove CO 2 Mix 25ml of ultrapure water with a stirrer for 1min to fully disperse the soil particles to obtain a soil solution.

[0097] (3) Determination of activation energy of metal sulfide mineral weathering in soil

[0098] a. Use 1200 mesh, 3000 mesh and 5000 mesh sandp...

Embodiment 2

[0105] (1) Fabrication of metal sulfide mineral electrodes

[0106] The pure and dense massive pyrite sample was cut to a suitable size to obtain a flat and measurable surface as the working area of ​​the electrode. In this embodiment, the pyrite sample is cut into a cuboid of 0.5 cm×0.5 cm×0.8 cm. After the copper wire is connected to the upper surface of the pyrite cuboid (0.5cm×0.5cm), epoxy resin is used to seal and cast the pyrite cuboid so that only the bottom surface of the pyrite cuboid (0.5cm×0.5cm) Connect with the outside world to get a pyrite electrode.

[0107] (2) Preparation of soil solution

[0108] Weigh 10.02 g of the air-dried saline-alkali soil sample that passed through a 2mm aperture sieve into a beaker. Add to remove CO 2 25ml of ultrapure water was stirred with a stirrer for 1min to fully disperse the soil particles to obtain a soil solution.

[0109] (3) Determination of activation energy of metal sulfide mineral weathering in soil

[0110] a. Us...

Embodiment 3

[0117] (1) Fabrication of metal sulfide mineral electrodes

[0118] The pure and dense massive arsenopyrite sample was cut to an appropriate size to obtain a flat and measurable surface as the working area of ​​the electrode. In this embodiment, the arsenopyrite sample is cut into a cube of 0.5 cm×0.5 cm×0.5 cm. After the copper wire is connected to the upper surface of the arsenopyrite cube, epoxy resin is used to seal and cast the arsenopyrite cube, so that only the bottom surface of the arsenopyrite cube communicates with the outside world to obtain the arsenopyrite electrode.

[0119] (2) Preparation of soil solution

[0120] Weigh 10.02 g of the air-dried meadow soil sample that passed through a 2mm aperture sieve into a beaker. Add to remove CO 2 Mix 25ml of ultrapure water with a stirrer for 1min to fully disperse the soil particles to obtain a soil solution.

[0121] (3) Determination of activation energy of metal sulfide mineral weathering in soil

[0122] a. Use...

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Abstract

The invention discloses a method for quickly measuring the weathering activation energy of metal sulfide minerals in soil, and relates to the technical field of environmental protection. In the present invention, metal sulfide minerals are first prepared as electrodes, air-dried soil is prepared into soil solution, and the electrochemical polarization curve test of metal sulfide minerals in soil solution at different temperatures is carried out to obtain the metal sulfide minerals in soil solution. Then take Tafel extrapolation to the obtained curve to obtain the corrosion current density of metal sulfide minerals in soil solution, according to the corrosion current density i corr The relationship between the temperature T and the calculated activation energy of metal sulfide mineral weathering in the soil. The determination method of the invention can realize the rapid determination of the weathering activation energy of metal sulfide minerals in soil, and at the same time, the invention has simple operation and low experimental cost, and provides a theoretical basis for determining the activation energy of minerals in different soils.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a method for quickly measuring the weathering activation energy of metal sulfide minerals in soil. Background technique [0002] Soil is an important place for the enrichment and accumulation of heavy metals. At present, the problem of soil pollution has been paid more and more attention by the state. [0003] Meadow soil and saline-alkali soil are two common soils in my country. In my country, meadow soil is widely distributed, with an area of ​​about 25.0705 million hectares, mainly located in the plains or basins of Northeast China, Inner Mongolia and Northwest China. The total area of ​​saline-alkali land in my country is 99 million hectares, accounting for about 10.3% of the land area, mainly distributed in the northeast, northwest and North China, and growing at a rate of 1.5% every year [Lv Yizhong et al. Soil Science. China Agricultural Press, 2008.; Wan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/416
CPCG01N27/416
Inventor 刘庆友王帅冯晓楠郑凯
Owner INST OF GEOCHEM CHINESE ACADEMY OF SCI
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